What is the chemical formula of hydrogen gas?
Analysis & Theory
Hydrogen gas exists as a diatomic molecule, H₂.
Hydrogen is considered a clean fuel because:
A
It emits nitrogen oxides when burned
B
It emits only water vapor on combustion
C
It is cheaper than coal
D
It emits sulfur dioxide
Analysis & Theory
When hydrogen burns, it combines with oxygen to produce only water vapor, making it a clean fuel.
Which of the following methods is commonly used to produce hydrogen industrially?
C
Fractional distillation
Analysis & Theory
Electrolysis involves splitting water into hydrogen and oxygen using electricity.
Which is the lightest and most abundant element in the universe?
Analysis & Theory
Hydrogen is the lightest and most abundant element in the universe.
Hydrogen gas is ______ under standard temperature and pressure.
Analysis & Theory
Under standard conditions, hydrogen exists as a colorless, odorless gas.
Which of the following is a key challenge in using hydrogen as a fuel?
C
Storage and transportation difficulties
Analysis & Theory
Hydrogen requires high-pressure tanks or cryogenic conditions, making its storage and transport challenging.
Hydrogen fuel cells generate electricity by combining hydrogen with:
Analysis & Theory
Fuel cells generate electricity through the electrochemical reaction of hydrogen and oxygen.
What is the by-product of hydrogen fuel cells?
Analysis & Theory
The only by-product of hydrogen fuel cells is water, making them environmentally friendly.
Hydrogen gas is highly:
Analysis & Theory
Hydrogen is highly flammable and can ignite easily in the presence of air or oxygen.
Which sector is actively researching hydrogen as a future fuel?
Analysis & Theory
Hydrogen is being explored across aerospace, automotive, and power sectors for its clean energy potential.